Anyone have a copy of QuickLoad? Need a favour

[prosper]

So, I'm loading up some spicy .357's for my GP-100, using lil gun and Hornady 180 grain XTP's. Hodgdon says the max is 15.0 grains at a COL of 1.590. But, what if I seat this bullet to the rear cannelure, for a COL of 1.685 or so (which will fit in the GP-100 cylinder)?

There would be a helluva lot more case capacity, and at 15 grains, pressures would be way down. So - what would a reasonable new maximum load at the longer COL be, according to Quickload?

 

[prosper]

at 1.590, 15.0 grains of lil-gun in S&B brass is 100% load density, it comes right up to the base of the bullet. At 1.685, 100% density is 18 grains, or 20% more capacity.

 

[Pathfinder]

Im guessing 357 magnum (saami) I guessed the barrel lenght but I dont' think it makes a diff pressure wise. Looks like 15 gr. is till on or near the upper limit according to what I inputed.

Mind you Im still a little skeptical about some of the calculations that come of out of that program sometimes.


Cartridge : .357 Magnum (SAAMI)
Bullet : .357, 180, Hornady HP/XTP 35771
Useable Case Capaci: 15.465 grain H2O = 1.004 cm³
Cartridge O.A.L. L6: 1.685 inch = 42.80 mm
Barrel Length : 5.0 inch = 127.0 mm
Powder : Hodgdon Lil'Gun
Predicted data by increasing and decreasing the given charge,
incremented in steps of 7.308% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !
Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-73.1 27 4.04 398 63 3278 1003 29.9 1.575
-65.8 35 5.13 454 83 3997 1400 32.2 1.407
-58.5 42 6.23 516 107 4956 1906 35.6 1.264
-51.2 49 7.33 585 137 6205 2544 40.0 1.140
-43.8 57 8.42 660 174 7809 3342 45.4 1.030
-36.5 64 9.52 737 217 9856 4284 51.1 0.931
-29.2 72 10.62 825 272 12467 5370 57.4 0.842
-21.9 79 11.71 922 340 15803 6577 64.0 0.760
-14.6 86 12.81 1028 422 20089 7870 70.7 0.684
-07.3 94 13.90 1141 520 25655 9201 77.1 0.609
+00.0 101 15.00 1261 635 32975 10516 83.1 0.537 ! Near Maximum !
+07.3 109 16.10 1387 769 42787 11751 88.5 0.474 !DANGEROUS LOAD-DO NOT USE!
+14.6 116 17.19 1519 922 56285 12829 93.1 0.416 !DANGEROUS LOAD-DO NOT USE!
+21.9 123 18.29 1658 1098 75528 13664 96.7 0.365 !DANGEROUS LOAD-DO NOT USE!
+29.2 131 19.38 1803 1299 104427 14151 99.0 0.318 !DANGEROUS LOAD-DO NOT USE!
+36.5 138 20.48 1956 1530 151250 14150 100.0 0.275 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 101 15.00 1372 752 41284 11419 92.5 0.485 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 101 15.00 1132 512 26161 9057 70.3 0.602

 

[prosper]

hm - interesting.

thnank you!